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Boiler Installation: New Boiler Cost and Replacement Cost Compared (2021)

This guide on boiler installation costs will take you through everything you should know about buying a new boiler.

Boiler installation

If you’re looking for a new boiler, there’s a good chance you’re confused by all the options. After all, there are tonnes of national installers such as Help-Link and British Gas, local installers, and even online quote comparison websites like Heatable. So, which company do you choose?

This guide covers everything you need to know before buying a new boiler. We’ve even included a boiler replacement cost comparison guide (with ACTUAL quotes we received), showing back-to-back prices from the likes of British Gas, Heatable and Help-Link.

In a hurry and not enough time to read the full guide? No problem — simply fill out this quick, anonymous form from Heatable and get a fixed boiler quote in 2 minutes.  

New boiler cost from Heatable

How Much Does It Cost to Install a New Boiler?

There are tonnes of factors at play here, but here are a few of the most common ones:

  • The boiler type that suits your property best
  • Whether or not you have to move your replacement boiler into a new spot
  • Which installer you choose to supply the boiler and perform the work

With this many variables, it’s difficult for me to tell you precisely how much your boiler installation will cost. If you want to get a quick, fixed quote yourself, you can use this online boiler quote calculator and see what Heatable offers you.

That said, I did prepare a table summarising average national boiler replacement costs across the UK. These are based on o reputable boiler brand in the the 24kw-30kw range.

Work required Boiler TypeCost
Replace boiler, using the existing locationRegular£1,900
Combination£1,900
Replace boiler, moving to a new locationRegular£2,350
Combination£2,300
Central heating system upgrade to a combination boiler (including removal of hot water tanks)Regular£2,850
Back boiler£3,200
Upgrade to a system boiler (retaining hot water tanks)Back boiler£2,700
Upgrade to a combination boilerBack boiler£3,200

Want an exact price?

Use this boiler quote calculator

New Boiler Cost – Boiler Installation Comparison

Of the three variables I listed above, 2 are pretty well beyond your control — you can’t change your property to suit a cheaper boiler. However, you can definitely save some money by choosing the right installer.

And that’s what we’ll discuss in this section. The comparison below will give you an idea of what to expect if you’re using an online installer like Heatable versus big names like British or Help-Link.

1. Heatable — The Fastest Way to Get a New Boiler Price

British Gas don’t allow you to get an instant online quote. But, there are a few companies that do; Heatable are one of them. And, Heatable have really shaken up the boiler replacement industry.

The good thing about Heatable, is you can log on, right now, and get a fixed price for a new boiler on-screen. There aren’t many companies offering that.

What kind of fuel does your boiler use?

Grab your fixed price online by 3PM, and get next-day boiler installation.

Worcester boilers installed from as little as £1,795.

We went through their quote process, to see what the prices come out at. And to be fair, we’re happy with what we saw.

After some research, we realised why all the boilers on offer are Worcester Bosch or Viessmann, and why they were so cheap; it’s their volumes of work allowing for cheaper acquisition costs.

The new boiler cost we were looking for, was going to be suitable for a 3 bedroomed flat. As you go through the quote process, you’ll see questions such as the type of flue, where the flue is located and how close it is to windows and doors.

For simplicity’s sake, we made sure our answers meant there’d be no additional work, besides the boiler swap.

Once we completed the quote process, we were given lots of different boiler prices (about 10 in total). Being quite familiar with boilers, we knew the Worcester 30I isn’t just a good boiler, it’s perfect for our property.

Boiler replacement cost from Heatable

£1,995 is a great price for a new boiler, especially a Worcester. And, there was also the option for the equivalent boiler, in compact form (so, it would fit in a kitchen cupboard). That’s a little more, but still a great deal.

As you scroll down, you’ll start hitting more expensive and higher output boilers. For example, the 30I you’ll see is the more powerful version of the 25I. Overall, the cost of a boiler replacement from Heatable, is nearing on being as cheap or cheaper than a local installer.

Have a look at the quote process, you can get a new boiler quote, without committing to putting in email addresses, phone numbers and so on; it takes about 3 minutes.

2. British Gas — Reliable, But Not the Cheapest

British Gas are one of the biggest companies in the boiler replacement industry. They fit a tonne of boilers.

So, if you’ve already had a quote, there’s a good chance it’s come from British Gas. However, regardless of the national firm (British Gas, e.ON, AA and so on), it’s unlikely that this is the way to get the cheapest quote.

In fact, looking at British Gas directly, even Help-Link (a national boiler installation company mentioned below) are cheaper. They (and I quote) claim to save on average, £1,081 when compared with a new boiler quote with British Gas.

New Boiler Installation Costs by British Gas

And, from my experience, you can expect to save a little more by using Heatable. Typically, we’d expect to see a saving of AT LEAST £1,000. The bigger and higher the price of the job, the more you’re likely to save.

Searching through a few online forums also reveals that what we guess, is true. Here, someone had quotes ranging from £2,350, through to £7,000 from British Gas (source: https://forums.moneysavingexpert.com/showthread.php?t=5853164).

What we’re comparing here is a like-for-like quote. Quotes will vary. Some quotes will include upgraded controls, boiler filters and more, others won’t. And, it’s important to take that into account.

So, are British Gas too expensive? Like all national companies, they have large overheads that have to be accounted for. A cute penguin for TV adverts might get your name out there, but TV adverts aren’t cheap.

A local installer will usually be much cheaper than a large national installer like British Gas. As will quote comparison websites like Heatable.

3. Help-Link — Quick Quote, but on the Pricier Side

Another place you can get a online boiler replacement quote is Help-Link.

We went through Help-Link’s online quote process, just as we did with Heatable. This isn’t a fixed quote, and we think that’s fair enough, sometimes a site visit is necessary.

Like the Heatable quote form, we picked all the simplest options, making this a straight boiler swap, rather than a full-on installation or central heating upgrade. And to be honest, I wasn’t that impressed.

New Boiler Installation Costs by Help-Link

Help-Link quoted us here over £2,000. And, whilst that might not seem like a big difference to the Heatable quote above, they’re quoting us for an Ideal Logic 24kw boiler.

Now, if you’ve read many of my other posts, you’ll know I rate high the Ideal Logic Plus range. But, as far as I can see, the Logic 24 HE, isn’t the plus, and that means you’ll only get a 2-year warranty. Typically, I’d be aiming for a 5-year warranty as a minimum.

You can grab 10-years upwards from Heatable on a tonne of boilers such as the Ideal Logic Plus, the Worcester Greenstar range, as well as others from Baxi, Vaillant and Potterton.

So, my opinion on the Help-Link boiler replacement is that it’s expensive. The option for a Worcester equivalent was nearly £500 more, putting this boiler replacement price at over £2,500; essentially, it’s the same job as the one we got a quote for on Heatable.

Best New Heating Boiler Deals

Said it before, will say it again. The price you will pay is dependant on who you choose to install.

Put simply? Get quotes until your heart is content. You can read dozens of articles like this one, trawl forums, and more, but that’s only going to give you an estimate.

The fact is, boiler costs do vary depending on the property, the area you live in, type of boiler, warranty, additional works, and more.

Get a FIXED Boiler Installation Quote!

Heatable boiler calculator

Personally, I think the best deals come from Heatable.

Nationals just have too many overheads to cover. And inevitably, that’s going to be added to your boiler quote. As we’ve highlighted above, these nationals can be £1,000 more expensive on many occasions.

As cheap as local boiler fitters are, there’s no doubt that websites that offer an instant online quote facility, like Heatable, are hot on their heels. So, it’s worth comparing local boiler fitters, with a Heatable quote too.

Want an exact price?

Use this boiler quote calculator

Finally: Do You Need Boiler Replacement?

Our advice is: not every appliance needs replacing. Sometimes, a repair is a more cost-effective solution. Typically, you’ll want to start investigating a new boiler quote, if your boiler is out of warranty, and there’s a repair bill looming of £500 or more.

Boilers are expensive to fix, and these fixes can be covered by warranties. And, that’s not to mention the fact that there have been plenty of studies showing a new A-Rated boiler could save up to £305 per year in energy.

Between zero repair costs and energy savings, a boiler replacement can quickly pay for itself.

Check out on-screen boiler installation costs using this quick form (no contact details needed, takes less than a minute of your time).

New Boiler Installation FAQ

Which is the best boiler to buy in 2021 for your home?

Worcester Bosch are renowned for being one of the most reliable brands in the UK heating space, offering the best customer service. Their Greenstar range including the 25i and 30i combi boilers are one of the best boilers to buy in 2021.

Is British Gas boiler installation expensive?

Large national companies such as British Gas are generally more expensive than local companies installing boilers, or companies using an online business model such as Heatable. These online boiler installation companies can cut out salespeople and site visits, meaning they can supply and fit boilers much cheaper than they would be able to otherwise.

How long should a home boiler last?

You should expect your boiler to last 10-15 years. But it’s worth considering a replacement before if your boiler is out of warranty and you’re getting large and frequent repair bills.

How much does it cost to replace a boiler in your home?

Combi boiler installation for residential properties tends to start in the region of £1,800 for a small budget appliance. This can extend to £2,500 and beyond for properties needing a large boiler, and an appliance with a long 10-year warranty.

How much does a standalone boiler cost?

Assuming we’re talking about gas boilers, a standalone boiler — with no installation or extras — can cost anywhere from £500 to £2,500, depending on the type, model, and capacity. New gas combis start at £500 and go as high as £2,000, with £1,000 being the average for a mid-range model. Systems boilers are just a bit more expensive, typically topping out at £2,500 without installation.

Why do installation costs vary so much?

Installation costs hinge on a host of factors — your boiler type and model, your location, your property, whether or not you need to install the boiler in a new place, and who you choose to install it for you. Simple swaps, where the new boiler goes into the exact same place as the old one, typically cost the least, whereas location changes and major alterations to infrastructure can quickly drive the costs up.

Likewise, using a large, national company to install your boiler rather than a local contractor or an online installer like Heatable may also cost you more. If you want to get a quick, fixed quote and use it as a benchmark against all the other estimates you solicit, I suggest you fill out this 90-second, anonymous survey from Heatable.

How long does it take to change a new boiler in your home?

Boiler installation costs

Expect a simple boiler installation to take 1-3 days. A straight swap without any upgrades would take 1 day. But, if the gas mains need to be upgraded, or you’re changing from a combi boiler or a system, the timescale could stretch to around 3 days.

Should I oversize my boiler?

No — oversizing your boiler is a bad idea. Not only will you pay more for a higher-capacity model that you don’t really need, but your oversized boiler won’t operate efficiently. That’s because all that excess heat it generates will fail to dissipate through a smaller radiator network, and the return water will be too hot for the boiler to run on the most efficient, ‘condensing’ mode. So, you’ll be wasting heat, and consequently, overpaying for your energy bill. It’s far better to get a good understanding of what boiler size you need before you proceed to buy one.

Getting a Boiler for Free

There are strict criteria when it comes to getting a boiler for free. Typically, it’s only pensioners that can get free boilers via the ECO (Energy Company Obligation) scheme. You can read our full guide to getting a free boiler here.

Conclusion on Boiler Installation

Looking to get an idea of what a new boiler will cost, and for a boiler replacement price estimate?

Spend a minute of your time using this clickable form, and get your fixed price on the screen instantly.

And, if you have any questions, leave a comment below.

We’ll get back to you as soon as possible.

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  1. Fantastically comprehensive article here, thanks. I’d certainly argue that getting a boiler from a local company as opposed to one of the big British corporations can be a smart move – after all, all tradespeople must be trained to industry standards and therefore you won’t necessarily get a lower quality of service. Equally, you’ll avoid bureaucracy, and if you’re saved both time and money, there’s no reason not to entrust this expensive purchase into the hands of local plumbers.

  2. Hi,
    Does the 10 year guarantee cover parts & labour, are they installed by local installers who also undertake any repairs. Whoever are responsible for any repairs are they reliable to promptly do them as I.e British Gas would, or are you kept waiting.
    Regards J Waldron.

  3. Is the price the same if the existing boiler is in an internal cupboard with a flue running a few metres through a bedroom cupboard to the outside wall? The existing flue meets the regs, want to check if it can be reused for a different boiler. Thanks, Steve

  4. my boilers 20 years old but its passed 19 services with one to come in november.
    i want to change to a new boiler but British gas dont give out prices. i will go to the websites you suggest to get a price idea.
    another factor is the cost of the service plan. i know i can half it with british gas so i will save there.
    i have an ideal boiler which nhas been great. it has had a few repairs but its still going.
    thanks for your article.

    1. Hi Mark, glad you liked our article. IDEAL boilers are great. Worcester Bosch are too. I think it may be a price and brand affinity option for you. No?

  5. I’ve had a couple of quotes and one for a Potterton Titanic heat only and the other for a Worcester Greenstar 18Ri which I can’t see on your list of boilers. It is currently located in a kitchen cupboard and will be replaced there.
    I have a 5 bedroom, 1 bath and 3 en-suite but have a massive water tank.
    I would need smart thermostats.
    I’m not sure of the answers to some of your questions and wondered if I could talk to someone or whether you do site visits.
    Thank you

    1. Hi Leila,

      Unfortunately, we don’t do site visits. I think you should check the links in our article, BOXT has great service. We recommend them.

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